HierarchicalDataTemplate.ItemContainerStyle Propriedade

Definição

Namespace:

System.Windows

Assembly:

PresentationFramework.dll

Obtém ou define o Style aplicado ao contêiner do item para cada item filho.

public:
 property System::Windows::Style ^ ItemContainerStyle { System::Windows::Style ^ get(); void set(System::Windows::Style ^ value); };

public System.Windows.Style ItemContainerStyle { get; set; }

member this.ItemContainerStyle : System.Windows.Style with get, set

Public Property ItemContainerStyle As Style

Valor da propriedade

Style

O Style aplicado ao contêiner do item para cada item filho.

Exemplos

O exemplo a seguir cria um TreeView que usa um estilo para itens em seu primeiro nível e outro estilo para itens em seu segundo nível. O estilo para o primeiro nível é definido na ItemContainerStyle propriedade do TreeView. O estilo para o segundo nível é definido na ItemContainerStyle propriedade do HierarchicalDataTemplate.

<StackPanel>
  <StackPanel.Resources>
    <src:TreeViewData x:Key="dataItems"/>


    <HierarchicalDataTemplate DataType="{x:Type src:ItemsForTreeView}"
                              ItemsSource="{Binding Path=SecondLevelItems}">

      <!--Display the TopLevelName property in the first level.-->
      <TextBlock Text="{Binding Path=TopLevelName}"/>
      
      <!--Display each string in the SecondLevelItems property in
          the second level.-->
      <HierarchicalDataTemplate.ItemTemplate>
          <DataTemplate>
              <TextBlock Text="{Binding}"/>
          </DataTemplate>
      </HierarchicalDataTemplate.ItemTemplate>
      
      <!--Set the foreground of the items in the second level
          to Navy.-->
      <HierarchicalDataTemplate.ItemContainerStyle>
        <Style TargetType="TreeViewItem">
          <Setter Property="Foreground" Value="Navy"/>
        </Style>
      </HierarchicalDataTemplate.ItemContainerStyle>  
    </HierarchicalDataTemplate>
  </StackPanel.Resources>

  <TreeView Height="200" 
            ItemsSource="{Binding Source={StaticResource dataItems}}"
            VirtualizingStackPanel.IsVirtualizing="True"
            VirtualizingStackPanel.VirtualizationMode="Recycling">
    <TreeView.ItemContainerStyle>
      
      <!--Expand each TreeViewItem in the first level and 
          set its foreground to Green.-->
      <Style TargetType="TreeViewItem">
        <Setter Property="IsExpanded" Value="True"/>
        <Setter Property="Foreground" Value="Green"/>
      </Style>
    </TreeView.ItemContainerStyle>
  </TreeView>
</StackPanel>

O exemplo a seguir cria os dados usados no exemplo anterior.

public class TreeViewData : ObservableCollection<ItemsForTreeView>
{

    public TreeViewData()
    {
        for (int i = 0; i < 100; ++i)
        {
            ItemsForTreeView item = new ItemsForTreeView();
            item.TopLevelName = "item " + i.ToString();
            Add(item);
        }
    }
}

public class ItemsForTreeView
{
    public string TopLevelName { get; set; }
    private ObservableCollection<string> level2Items;

    public ObservableCollection<string> SecondLevelItems
    {
        get 
        {
            level2Items ??= new ObservableCollection<string>();
            return level2Items;
        }
    }

    public ItemsForTreeView()
    {
        for (int i = 0; i < 10; ++i)
        {
            SecondLevelItems.Add("Second Level " + i.ToString());
        }
    }
}

Public Class TreeViewData
    Inherits ObservableCollection(Of ItemsForTreeView)

    Public Sub New()
        For i As Integer = 0 To 99
            Dim item As New ItemsForTreeView()
            item.TopLevelName = "item " & i.ToString()
            Add(item)
        Next
    End Sub
End Class


Public Class ItemsForTreeView
    Private _TopLevelName As String
    Public Property TopLevelName() As String
        Get
            Return _TopLevelName
        End Get
        Set(ByVal value As String)
            _TopLevelName = value
        End Set
    End Property
    Private level2Items As ObservableCollection(Of String)

    Public ReadOnly Property SecondLevelItems() As ObservableCollection(Of String)
        Get
            If level2Items Is Nothing Then
                level2Items = New ObservableCollection(Of String)()
            End If
            Return level2Items
        End Get
    End Property

    Public Sub New()
        For i As Integer = 0 To 9
            SecondLevelItems.Add("Second Level " & i.ToString())
        Next
    End Sub
End Class

Comentários

Você usa essa propriedade ou a ItemContainerStyleSelector propriedade para definir um estilo para afetar a aparência dos elementos que contêm os itens de dados. Por exemplo, para TreeView, os contêineres gerados são TreeViewItem controles; para Menu, eles são MenuItem controles.